IWC · Portugieser
Strap for Portugieser Constant-Force Tourbillon Double Moon Red Gold / Ardoise
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
20mm
Lug width20 mm
Case diameter46 mm
ReferenceIW5901-01 (aka: IW590101)
FamilyPortugieser
MovementIWC caliber 94800
Minutes, Hours, Small Seconds | Moonphase | Constant Force Mechanism, Tourbillon Escapement, Power Reserve Indicator
CaseRed Gold
Straps for the Portugieser IW5901-01 (aka: IW590101)
Selected for the 20 mm lug width · workshop selection
Green Rubberized Alligator Strap with Ecru Tribal Stitching€185
Novonappa Black Strap — IWC Pilot Style€149
Black Alligator Strap with Light Blue Edges€210
Black Alligator Strap with White Edges€210
Millenium Cognac Alligator Strap€270
The Portugieser IW5901-01 (aka: IW590101), seen from the bench
The IWC Portugieser IW5901-01 is a contemporary evolution of a 1930s legend, featuring the IWC 94800 mechanical caliber with tourbillon and constant-force mechanism. The 46mm red gold case houses a power reserve indicator and double moonphase complication, delivering chronometric precision even as the mainspring depletes over approximately 7 days. The 20mm lug width accommodates straps proportionate to the case diameter, maintaining IWC Schaffhausen's classical design philosophy of generous proportions, applied gold indices, and functional elegance without compromise.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only